If you found skipping that cigarette very difficult or even failed in the end, review any factor that got in the way of your success.  The most common causes of difficulty or failure that a potential quitter faces are:

Chemical properties of addiction

When you do not have that cigarette, you feel lousy. If you are a heavy smoker, a nicotine patch may help to relieve your bad feelings.

Social pressures

You may find yourself in a situation (card game, party, coffee break) during which you would normally smoke. It may help to let others know of your desire to quit, and also your reasons for quitting. Enlisting the aid of a non smoker to confide in may also help. Make sure that he or she is aware of your goals so that they do not say or do anything to instill a negative impact on your desire to quit.

If you feel that you may not resist the social pressures of smoking, consider the option of giving up these social encounters for two or three weeks until the urge passes and you can be comfortable again.